400149769 has 2 divisors, whose sum is σ = 400149770. Its totient is φ = 400149768.

The previous prime is 400149751. The next prime is 400149809. The reversal of 400149769 is 967941004.

It is a happy number.

It is an a-pointer prime, because the next prime (400149809) can be obtained adding 400149769 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400000000 + 149769 = 20000^2 + 387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400149769 is a prime.

It is a super-2 number, since 2×400149769² = 320239675261506722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (404149769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200074884 + 200074885.

It is an arithmetic number, because the mean of its divisors is an integer number (200074885).

Almost surely, 2^400149769 is an apocalyptic number.

It is an amenable number.

400149769 is a deficient number, since it is larger than the sum of its proper divisors (1).

400149769 is an equidigital number, since it uses as much as digits as its factorization.

400149769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 400149769 is about 20003.7438745851. The cubic root of 400149769 is about 736.8982472056.

It can be divided in two parts, 400 and 149769, that multiplied together give a square (59907600 = 7740²).

The spelling of 400149769 in words is "four hundred million, one hundred forty-nine thousand, seven hundred sixty-nine".