402071557 has 8 divisors (see below), whose sum is σ = 410431320. Its totient is φ = 393768960.

The previous prime is 402071531. The next prime is 402071561. The reversal of 402071557 is 755170204.

It can be written as a sum of positive squares in 4 ways, for example, as 16695396 + 385376161 = 4086^2 + 19631^2 .

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 402071557 - 2¹⁵ = 402038789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402051557) 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, 69 + ... + 28357.

It is an arithmetic number, because the mean of its divisors is an integer number (51303915).

Almost surely, 2^402071557 is an apocalyptic number.

It is an amenable number.

402071557 is a deficient number, since it is larger than the sum of its proper divisors (8359763).

402071557 is a wasteful number, since it uses less digits than its factorization.

402071557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28583.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 402071557 is about 20051.7220457496. The cubic root of 402071557 is about 738.0760571384.

The spelling of 402071557 in words is "four hundred two million, seventy-one thousand, five hundred fifty-seven".