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388977942 = 23191333889
BaseRepresentation
bin10111001011110…
…101010100010110
31000002221010102110
4113023311110112
51244034243232
6102333051450
712432154323
oct2713652426
91002833373
10388977942
1118a627981
12aa326b86
1362782782
1439935b4a
1524237acc
hex172f5516

388977942 has 16 divisors (see below), whose sum is σ = 778385520. Its totient is φ = 129587712.

The previous prime is 388977913. The next prime is 388977949. The reversal of 388977942 is 249779883.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388977949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5467 + ... + 28422.

It is an arithmetic number, because the mean of its divisors is an integer number (48649095).

Almost surely, 2388977942 is an apocalyptic number.

388977942 is an abundant number, since it is smaller than the sum of its proper divisors (389407578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388977942 is a wasteful number, since it uses less digits than its factorization.

388977942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35807.

The product of its digits is 6096384, while the sum is 57.

The square root of 388977942 is about 19722.5237228910. The cubic root of 388977942 is about 729.9755680820.

The spelling of 388977942 in words is "three hundred eighty-eight million, nine hundred seventy-seven thousand, nine hundred forty-two".