400782749 has 16 divisors (see below), whose sum is σ = 419973120. Its totient is φ = 382128000.

The previous prime is 400782737. The next prime is 400782773. The reversal of 400782749 is 947287004.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400782749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400782719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 477272 + ... + 478110.

It is an arithmetic number, because the mean of its divisors is an integer number (26248320).

Almost surely, 2^400782749 is an apocalyptic number.

It is an amenable number.

400782749 is a deficient number, since it is larger than the sum of its proper divisors (19190371).

400782749 is a wasteful number, since it uses less digits than its factorization.

400782749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 400782749 is about 20019.5591609805. The cubic root of 400782749 is about 737.2865985649.

The spelling of 400782749 in words is "four hundred million, seven hundred eighty-two thousand, seven hundred forty-nine".