400948957 has 2 divisors, whose sum is σ = 400948958. Its totient is φ = 400948956.

The previous prime is 400948943. The next prime is 400948967. The reversal of 400948957 is 759849004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248031001 + 152917956 = 15749^2 + 12366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400948957 is a prime.

It is a super-2 number, since 2×400948957² = 321520132238775698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400948967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200474478 + 200474479.

It is an arithmetic number, because the mean of its divisors is an integer number (200474479).

Almost surely, 2^400948957 is an apocalyptic number.

It is an amenable number.

400948957 is a deficient number, since it is larger than the sum of its proper divisors (1).

400948957 is an equidigital number, since it uses as much as digits as its factorization.

400948957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 400948957 is about 20023.7098710504. The cubic root of 400948957 is about 737.3885041445.

The spelling of 400948957 in words is "four hundred million, nine hundred forty-eight thousand, nine hundred fifty-seven".