1239900749 has 16 divisors (see below), whose sum is σ = 1286489088. Its totient is φ = 1194316032.

The previous prime is 1239900737. The next prime is 1239900751. The reversal of 1239900749 is 9470099321.

It is a cyclic number.

It is not a de Polignac number, because 1239900749 - 2²⁸ = 971465293 is a prime.

It is a super-2 number, since 2×1239900749² = 3074707734741522002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239900719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 833084 + ... + 834570.

It is an arithmetic number, because the mean of its divisors is an integer number (80405568).

Almost surely, 2^1239900749 is an apocalyptic number.

It is an amenable number.

1239900749 is a deficient number, since it is larger than the sum of its proper divisors (46588339).

1239900749 is a wasteful number, since it uses less digits than its factorization.

1239900749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1239900749 is about 35212.2244256167. The cubic root of 1239900749 is about 1074.3084065068.

The spelling of 1239900749 in words is "one billion, two hundred thirty-nine million, nine hundred thousand, seven hundred forty-nine".