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49942489 = 3721912
BaseRepresentation
bin1011111010000…
…0111111011001
310110222100012211
42332200333121
5100241124424
64542235121
71144334632
oct276407731
9113870184
1049942489
1126211593
1214885aa1
13a46818c
1468c0889
1545b7b94
hex2fa0fd9

49942489 has 9 divisors (see below), whose sum is σ = 51598911. Its totient is φ = 48338280.

The previous prime is 49942441. The next prime is 49942493. The reversal of 49942489 is 98424994.

The square root of 49942489 is 7067.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 44689225 + 5253264 = 6685^2 + 2292^2 .

It is not a de Polignac number, because 49942489 - 221 = 47845337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (49942289) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 261384 + ... + 261574.

Almost surely, 249942489 is an apocalyptic number.

49942489 is the 7067-th square number.

49942489 is the 3534-th centered octagonal number.

It is an amenable number.

49942489 is a deficient number, since it is larger than the sum of its proper divisors (1656422).

49942489 is an frugal number, since it uses more digits than its factorization.

49942489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 228 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

The cubic root of 49942489 is about 368.2618474502.

Multiplying 49942489 by its sum of digits (49), we get a square (2447181961 = 494692).

Multiplying 49942489 by its product of digits (746496), we get a square (37281868268544 = 61058882).

The spelling of 49942489 in words is "forty-nine million, nine hundred forty-two thousand, four hundred eighty-nine".

Divisors: 1 37 191 1369 7067 36481 261479 1349797 49942489