402547981 has 8 divisors (see below), whose sum is σ = 464975424. Its totient is φ = 344425920.

The previous prime is 402547961. The next prime is 402548021. The reversal of 402547981 is 189745204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402547981 - 2⁵ = 402547949 is a prime.

It is a super-2 number, since 2×402547981² = 324089754014352722, 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 (402547931) 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, 1076145 + ... + 1076518.

It is an arithmetic number, because the mean of its divisors is an integer number (58121928).

Almost surely, 2^402547981 is an apocalyptic number.

It is an amenable number.

402547981 is a deficient number, since it is larger than the sum of its proper divisors (62427443).

402547981 is a wasteful number, since it uses less digits than its factorization.

402547981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2152691.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 402547981 is about 20063.5984060686. The cubic root of 402547981 is about 738.3674632700.

The spelling of 402547981 in words is "four hundred two million, five hundred forty-seven thousand, nine hundred eighty-one".