1261433190 has 16 divisors (see below), whose sum is σ = 3027439728. Its totient is φ = 336382176.

The previous prime is 1261433189. The next prime is 1261433203. The reversal of 1261433190 is 913341621.

It is a super-2 number, since 2×1261433190² = 3182427385667152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 42047773 = 1261433190 / (1 + 2 + 6 + 1 + 4 + 3 + 3 + 1 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21023857 + ... + 21023916.

It is an arithmetic number, because the mean of its divisors is an integer number (189214983).

Almost surely, 2^1261433190 is an apocalyptic number.

1261433190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261433190 is an abundant number, since it is smaller than the sum of its proper divisors (1766006538).

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

1261433190 is a wasteful number, since it uses less digits than its factorization.

1261433190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42047783.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 1261433190 is about 35516.6607383070. The cubic root of 1261433190 is about 1080.4916571463.

The spelling of 1261433190 in words is "one billion, two hundred sixty-one million, four hundred thirty-three thousand, one hundred ninety".