400001052 has 48 divisors (see below), whose sum is σ = 1019700864. Its totient is φ = 121032000.

The previous prime is 400001039. The next prime is 400001059. The reversal of 400001052 is 250100004.

It is a super-2 number, since 2×400001052² = 320001683202213408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400001059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106527 + ... + 110217.

It is an arithmetic number, because the mean of its divisors is an integer number (21243768).

Almost surely, 2^400001052 is an apocalyptic number.

It is an amenable number.

400001052 is an abundant number, since it is smaller than the sum of its proper divisors (619699812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400001052 is a wasteful number, since it uses less digits than its factorization.

400001052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4530 (or 4528 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 400001052 is about 20000.0262999827. The cubic root of 400001052 is about 736.8069456610.

Adding to 400001052 its reverse (250100004), we get a palindrome (650101056).

The spelling of 400001052 in words is "four hundred million, one thousand, fifty-two".