402540771 has 12 divisors (see below), whose sum is σ = 539168136. Its totient is φ = 267140160.

The previous prime is 402540767. The next prime is 402540781. The reversal of 402540771 is 177045204.

It is not a de Polignac number, because 402540771 - 2² = 402540767 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402540731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637626 + ... + 638256.

It is an arithmetic number, because the mean of its divisors is an integer number (44930678).

Almost surely, 2^402540771 is an apocalyptic number.

402540771 is a deficient number, since it is larger than the sum of its proper divisors (136627365).

402540771 is an frugal number, since it uses more digits than its factorization.

402540771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 402540771 is about 20063.4187266278. The cubic root of 402540771 is about 738.3630549663.

Adding to 402540771 its reverse (177045204), we get a palindrome (579585975).

The spelling of 402540771 in words is "four hundred two million, five hundred forty thousand, seven hundred seventy-one".