402040251 has 12 divisors (see below), whose sum is σ = 581636328. Its totient is φ = 267606144.

The previous prime is 402040241. The next prime is 402040283. The reversal of 402040251 is 152040204.

It is not a de Polignac number, because 402040251 - 2¹⁹ = 401515963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (402040201) 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, 28950 + ... + 40523.

It is an arithmetic number, because the mean of its divisors is an integer number (48469694).

Almost surely, 2^402040251 is an apocalyptic number.

402040251 is a deficient number, since it is larger than the sum of its proper divisors (179596077).

402040251 is a wasteful number, since it uses less digits than its factorization.

402040251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70122 (or 70119 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 402040251 is about 20050.9413993458. The cubic root of 402040251 is about 738.0569006737.

Adding to 402040251 its reverse (152040204), we get a palindrome (554080455).

It can be divided in two parts, 4020402 and 51, that multiplied together give a palindrome (205040502).

The spelling of 402040251 in words is "four hundred two million, forty thousand, two hundred fifty-one".