400121023 has 4 divisors (see below), whose sum is σ = 404246080. Its totient is φ = 395995968.

The previous prime is 400121003. The next prime is 400121039. The reversal of 400121023 is 320121004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400121023 - 2⁵ = 400120991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400120994 and 400121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400121003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062383 + ... + 2062576.

It is an arithmetic number, because the mean of its divisors is an integer number (101061520).

Almost surely, 2^400121023 is an apocalyptic number.

400121023 is a deficient number, since it is larger than the sum of its proper divisors (4125057).

400121023 is an equidigital number, since it uses as much as digits as its factorization.

400121023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125056.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 400121023 is about 20003.0253461820. The cubic root of 400121023 is about 736.8806009925.

Adding to 400121023 its reverse (320121004), we get a palindrome (720242027).

The spelling of 400121023 in words is "four hundred million, one hundred twenty-one thousand, twenty-three".