400020739 has 2 divisors, whose sum is σ = 400020740. Its totient is φ = 400020738.

The previous prime is 400020721. The next prime is 400020749. The reversal of 400020739 is 937020004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400020739 - 2¹⁵ = 399987971 is a prime.

It is a super-2 number, since 2×400020739² = 320033183260212242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400020749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200010369 + 200010370.

It is an arithmetic number, because the mean of its divisors is an integer number (200010370).

Almost surely, 2^400020739 is an apocalyptic number.

400020739 is a deficient number, since it is larger than the sum of its proper divisors (1).

400020739 is an equidigital number, since it uses as much as digits as its factorization.

400020739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 400020739 is about 20000.5184682798. The cubic root of 400020739 is about 736.8190333629.

The spelling of 400020739 in words is "four hundred million, twenty thousand, seven hundred thirty-nine".