402449551 has 12 divisors (see below), whose sum is σ = 488591728. Its totient is φ = 324663552.

The previous prime is 402449543. The next prime is 402449557. The reversal of 402449551 is 155944204.

It is not a de Polignac number, because 402449551 - 2³ = 402449543 is a prime.

It is a super-2 number, since 2×402449551² = 323931282200203202, 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 (402449557) 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 11 ways as a sum of consecutive naturals, for example, 97446 + ... + 101491.

Almost surely, 2^402449551 is an apocalyptic number.

402449551 is a deficient number, since it is larger than the sum of its proper divisors (86142177).

402449551 is a wasteful number, since it uses less digits than its factorization.

402449551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198978 (or 198961 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 402449551 is about 20061.1453062880. The cubic root of 402449551 is about 738.3072771246.

The spelling of 402449551 in words is "four hundred two million, four hundred forty-nine thousand, five hundred fifty-one".